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Physics

Which of the following are isobars ?

  1. 612C^{12}6\text{C} and 614C^{14}6\text{C}
  2. 816O^{16}8\text{O} and 1123Na^{23}{11}\text{Na}
  3. 1123Na^{23}{11}\text{Na} and 1122Mg^{22}{11}\text{Mg}
  4. 1123Na^{23}{11}\text{Na} and 1223Mg^{23}{12}\text{Mg}

Radioactivity

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Answer

1123Na^{23}{11}\text{Na} and 1223Mg^{23}{12}\text{Mg}

Reason — Isobars are atoms having the same mass number but different atomic number. Hence, 1123Na^{23}{11}\text{Na} and 1223Mg^{23}{12}\text{Mg} are isobars.

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